/Engine/Source/Runtime/Engine/Classes/Kismet/KismetSystemLibrary.h
Draw directional arrow, pointing from LineStart to LineEnd.
static void DrawDebugArrow ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * WorldContextObject, const FVector LineStart, const FVector LineEnd, float ArrowSize, [FLinearColor](API\Runtime\Core\Math\FLinearColor) LineColor, float Duration, float Thickness )